/* roulang page: index */
:root {
      --deep-blue: #0B0C1E;
      --dark-surface: #1A1F3A;
      --electric-purple: #A855F7;
      --ice-cyan: #22D3EE;
      --text-primary: #E2E8F0;
      --text-secondary: #94A3B8;
      --text-muted: #64748B;
      --glass-bg: rgba(255, 255, 255, 0.03);
      --glass-border: rgba(255, 255, 255, 0.08);
      --glass-hover-border: rgba(168, 85, 247, 0.5);
      --card-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
      --glow-purple: 0 0 20px rgba(168, 85, 247, 0.5);
      --glow-cyan: 0 0 25px rgba(34, 211, 238, 0.4);
      --radius-lg: 1.5rem;
      --radius-md: 1rem;
    }

    * {
      box-sizing: border-box;
    }

    body {
      font-family: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', sans-serif;
      background: linear-gradient(135deg, var(--deep-blue) 0%, #0f1025 100%);
      color: var(--text-primary);
      margin: 0;
      line-height: 1.6;
      -webkit-font-smoothing: antialiased;
      overflow-x: hidden;
    }

    .glass-card {
      background: rgba(255, 255, 255, 0.03);
      backdrop-filter: blur(16px);
      -webkit-backdrop-filter: blur(16px);
      border: 1px solid rgba(255, 255, 255, 0.08);
      border-radius: var(--radius-lg);
      box-shadow: var(--card-shadow);
      transition: all 0.3s ease;
    }

    .glass-card:hover {
      border-color: rgba(168, 85, 247, 0.45);
      box-shadow: 0 0 35px rgba(168, 85, 247, 0.15), 0 20px 40px rgba(0,0,0,0.4);
      transform: translateY(-4px);
    }

    .gradient-text {
      background: linear-gradient(135deg, #A855F7, #22D3EE);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .glow-button {
      background: linear-gradient(135deg, #A855F7, #22D3EE);
      border: none;
      color: white;
      font-weight: 700;
      border-radius: 9999px;
      padding: 0.9rem 2.5rem;
      box-shadow: 0 0 20px rgba(168, 85, 247, 0.5);
      transition: all 0.3s ease;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      letter-spacing: 0.5px;
      cursor: pointer;
      text-decoration: none;
    }

    .glow-button:hover {
      box-shadow: 0 0 35px rgba(34, 211, 238, 0.7);
      transform: scale(1.05);
      color: white;
    }

    .outline-button {
      background: transparent;
      border: 2px solid rgba(255,255,255,0.3);
      color: white;
      font-weight: 600;
      border-radius: 9999px;
      padding: 0.9rem 2.5rem;
      transition: all 0.3s ease;
      backdrop-filter: blur(4px);
      cursor: pointer;
      text-decoration: none;
      display: inline-flex;
      align-items: center;
      justify-content: center;
    }

    .outline-button:hover {
      border-color: #A855F7;
      background: rgba(255,255,255,0.05);
      color: #22D3EE;
      box-shadow: 0 0 20px rgba(168,85,247,0.3);
    }

    .nav-link {
      position: relative;
      color: rgba(255,255,255,0.8);
      transition: color 0.2s;
      font-weight: 500;
      text-decoration: none;
    }

    .nav-link:hover {
      color: white;
    }

    .nav-link::after {
      content: '';
      position: absolute;
      bottom: -4px;
      left: 0;
      width: 0%;
      height: 2px;
      background: linear-gradient(to right, #A855F7, #22D3EE);
      transition: width 0.3s;
    }

    .nav-link:hover::after {
      width: 100%;
    }

    .faq-details {
      background: rgba(255,255,255,0.02);
      backdrop-filter: blur(8px);
      border: 1px solid rgba(255,255,255,0.05);
      border-radius: var(--radius-md);
      margin-bottom: 1rem;
      transition: all 0.3s;
    }

    .faq-details[open] {
      background: rgba(255,255,255,0.05);
      border-left: 4px solid #22D3EE;
    }

    .faq-summary {
      padding: 1.2rem 1.5rem;
      font-weight: 600;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      list-style: none;
      border-left: 4px solid #A855F7;
      transition: 0.2s;
    }

    .faq-details[open] .faq-summary {
      border-left-color: #22D3EE;
    }

    .faq-summary::-webkit-details-marker {
      display: none;
    }

    .input-field {
      background: rgba(255,255,255,0.05);
      border: 1px solid rgba(255,255,255,0.1);
      border-radius: 1rem;
      padding: 0.9rem 1.2rem;
      color: white;
      transition: all 0.3s;
      width: 100%;
      outline: none;
    }

    .input-field:focus {
      border-color: #A855F7;
      box-shadow: 0 0 15px rgba(168,85,247,0.3);
    }

    @media (max-width: 768px) {
      .mobile-menu {
        display: none;
      }
      .mobile-menu.open {
        display: flex;
      }
    }